I'm currently storing PDF reports in a Rackspace cloud files container. These files are generated from a web application. I'm keen to find a way to sync these files to an Amazon s3 container as a form of backup/redundancy.
So far I've only come across this PHP script which (with a few modifications to fix bugs) seems to work:
http://quicloud.com/blog/cross-provider-cloud-file-backups-rackspace-cloudfiles-amazon-s3.html
I'm wondering if there are any better ways to achieve this on Ubuntu (command line).